Calling static method like business layer

Hi all,
can someone write me if is normal to have business layer of static methods.

Example: from page.aspx.cs calling static method in other assembly (static methods doesnt use state variables). Can be some problem when more requests will be calling that static method in same time? And How static methods works? That method is created (new instance of some object) when it is calling and in the end is disposed?

Thanks

re: Calling static method like business layer

Hi, you accidentally posted in the ASP classic forum, instead of the ASP.NET forum. I have moved it over for you.